Post-Tensioned Concrete Beams Strengthened in Shear Using Fiber-Reinforced Polymer Laminates and Patch Anchors

AbstractStrengthening concrete bridges using fiber-reinforced polymers (FRPs) in flexure, shear, and torsion is limited by the occurrence of premature FRP debonding which often controls the degree of strengthening possible using this approach. To address this issue, anchorage systems have been devel...

Full description

Saved in:
Bibliographic Details
Published in:Journal of composites for construction 2020-04, Vol.24 (2)
Main Authors: Kalfat, Robin, Jumaah, Reem, Al-Mahaidi, Riadh, Abdouka, Kamiran, Hashemi, Javad
Format: Article
Language:English
Subjects:
Anchors
Beams (structural)
Concrete bridges
Debonding
Delamination
Failure modes
Fiber reinforced concretes
Fiber reinforced plastics
Fiber reinforced polymers
Field theory
Flexing
Laminates
Post-tensioned concrete
Post-tensioning
Repair & maintenance
Shear
Technical Papers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:AbstractStrengthening concrete bridges using fiber-reinforced polymers (FRPs) in flexure, shear, and torsion is limited by the occurrence of premature FRP debonding which often controls the degree of strengthening possible using this approach. To address this issue, anchorage systems have been developed in recent years to mitigate FRP debonding failure modes with the objective of achieving higher levels of strengthening using less material. Of the many types of anchorage systems researched to date, joint level tests have revealed that bidirectional fiber patches placed at the ends of the FRP laminates can significantly delay the occurrence of FRP debonding. This study presents the first experimental application where patch anchors are evaluated in post-tensioned concrete beams strengthened in shear using FRP laminates. Three specimens were tested including an unstrengthened control beam and strengthened beams with and without anchors. The anchors were proven to significantly improve the shear capacity of the member and increase the FRP laminate strain utilization prior to failure. The experimental results were verified against predictions provided by the modified compression field theory (MCFT) and the ACI 318. A semiempirical model (SE model) was proposed to predict the shear contributions provided by the anchored FRP laminates.
ISSN:1090-0268
1943-5614
DOI:10.1061/(ASCE)CC.1943-5614.0000989